Method of and apparatus for forming paper end closures



2,492,886 R s 2 Sheets-Sheet l P A A US D OS mxo

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Dec. 27, 1949 w. F. PUNTE 2,492,886

METHOD OF AND APPARATUS FOR FORMING PAPER END CLOSURES I Filed June 30, 1944 2 Sheets-Sheet 2 :inventor Cttornegs Patented Dec. 27, 1.949

UNITED 'axgassc METHOD 'DF APPARATUS FOR. .FORM- ."INGPPER'END CIGSURES William!F.fPime;1Pmaie, .,fassignorftrr7 Gom' L. tinentals Ga'mGompany, Ine., r =N ew lurk, N. X., azcorporatlon oNemYoi-k 'Application Time 44*30, 1944, ."SeiillNo. 542,960

This invention relates to anovel methdf-'and novel means for/making paper `eridclosuresflor use on containers.

More specifically, paper 'containerf'eI-idsfff the type under consideration I"are circular -i-nsshape and have formed therein I'annillar-cliaxmelswir grooves to receive theend vedges vofthewvaslls:of the container. Usually ione-or both ends *er closures are adhesivelysecuredftoltlfreedge f-the container walls, ralthough one 'of saidfendsori-if desired both ends, maybe held thereonbyifriction without the use of anyfadhesivedependi-ng upon the use to which the-container is-to"be"put. It is old in the art -tostamp out lends fofitlfiis general type in whichv both walls of the groove are formed over a diering having paral-lelfcylindrical wall portions. However"whenfm'aide 'iii-nthis form and by this manner, the'oterl-fwallor skirt, having a certain amount ofrinherentfresiliency, does not retain its perfect cyl-iridriealform so as to snugly-fit the adjacent Vpo'rt'fion'ot"the container end wall, but flares more -or"IessGoutwardly thereby failing to make lor=maintain:fra tight joint with the wall.

An object oi the invention "is to 'provide-san` improved method for manufacturingfsaidzven'tls and novel means for-eie'ctivel-y fearryin'g Jsaid method into successful operation.

More specically, the improvedimethddf'consists in first cutting the blank fromm'fsheetff material, and shaping the same toformfthe'l bddy portion, a peripheral wall or heel portion atsirbstantially right angles thereto and`an outwardly extending flange; second, trimming-saidflange to correct size and' turning it 'into substantial parallelism with said peripheral -Wally-andi'then bending said flange, which forms the outerf-wall of the peripheral groove or channel `slightly Vlinwardly in channel restricting relation 1vto Isaid peripheral wall and cramping theberso'said outer wall to form a smooth inner surface thereon adapted for snug engagement with 'thefwall of the container and to cause the outer wall' to`V lose its tendency to spring outwardly when released.

With the above and other objects inf-view that will hereinafter appear, the nature ofy the'invention will be more clearlyunderstood VVAbyire'ference to the following detailed description, the appended claims, and the several'views villustrated in the accompanying drawing.

In the drawings:

Figure l is a sectional view of a dieforir'iil'iially stamping the end from a sheet ofstoclrmaterial and shaping the same in the first stageywi'tlthe outwardly extending peripheraliiange.

adenine. (crea-asl 35, thamheebiank Yusedror the finished-article; ma

Figure i 2 i is 'a lsimilar view lcf the die for f -accurately trimming the Ledge uof A:sa-id peripheral ange aridi turning'-'sai"d `iiange at'substantially right -angles toy the Jplan-e "of the l end, "to form theA skirtfsaid die being shown in v"operr position.

4'Figure 3^is adetail-sectionofftheidiastructure o'f''Figure"2 illustrating the sameatthe `instant oftiimming `the 'edge'of the fla-nge.

1f-isa' similar view illustrating'theposition 'of' the'severalparts u-porrturningA the AHarige.

Y"Figure' 5 vis a simi-larviewofthe' die mechanism forcompletingl the operation by'turning theange' or 'skirt `slightly inwardly, 'fa-nd 1 cram-ping "the same` in saidinturned position; thevsaid Vfdiefbeing shown'in cpen^positio`ny "Figure-6 isa 'detail'sectionalcvlew' of the-'saine inclosed'-position. Y

F-Figure 'I is an xedge elevation, "partly in `section,^o'fthe'completederid or closure.

-"In"carryingeoi-it the' invention-the' blanks from which the ends are made are first stampedffrom a .sheet of material,"preferably4 paper, by mea-ns of a'suitable stampingdie'such as illustrati-odin Figure" 1 oftheizlrawings;andbyv thevsame Ldevice pressedr or drawn to form the -body portion-with a peripheral wa-11 at -substantially'-right i angles theretofand an'outwardlyextending flange. :As illustrated 'in said FigureT` 1, the-die -comprisesca stationary. cutting -and^mol`ding-portion Fitl 'andfa reciprocating portion l l foncoopera'tion -l therewith. "The" stationary portion consists-'in *acuttingring l2 nesting inaseatl3-'in'a'base or'support M,-a central molding block 5,A anda-ring lli-betweensaidblockand t-lieri-ng l2. AAThe-'ring lhas abore Ils-oa dimension lsomewhat'larger Themold-ing block {fwhich -is-arrangd' centrallywithin ther ring |2 com-prisessan- -enlargedfupper portion f2| shaped to -fform the vvbody "portion which 'the -end is tohavewhencompleted, Land a reduced lower end #22 held ir1-a-fseat=23 in 'the support I'Mby Asuitablesecuring means,'-fsuchf= as fa screw 24. -The body'portionsof theinishedends areusually' `flat and circularftolt within the-walls of^a^cylindrical receptacle, and fvvillfl 4be fso referred tof'hereinafter,'ibut'lit is to 7beu-nderstood thatpifjpreferred, thebodyinay be arched-or cupped, and'maybe' circular, Yoval yor- 'polygonal'rto t^receptacles-oi any-desired shape. 'Y'Ihe 1upper face v25 oftheblockilf is below the' plane of the cutting* edge I 9, and between'said block and the cutting ring is the ring I6 having a bore-'26 snugly receiving the upper portion 2| of the block I5, and a base flange 21 extending under the portion 2l to adjacent the reduced portion 22. The upper face 28 of the ring I6 is in a plane below the upper face of the block I5 a distance substantially equal to the depth of the annular groove or channel tobe formed.

The upper or reciprocating portion of the die comprises a shearing block 29 which nts substantially snugly in the bore I'I of the cutting ring, and a knock-out block 30 which also conforms to and cooperates with the upper face 25 of the molding block I5 to shape the body portion of the closure. This knock-out lblock is arranged within a bore 3| in the block 29 and is supportedv by a stem 32 reciprocable in a bore 33 extendingy through said block and a central extension 34. thereon. The stern extends above the upper end of the portion 34 and is provided with an abutment 35 between whiclrand said end is a spring 36 normally holding the block 38 retracted.

In operation a sheet of stock material is p0- sitioned above the cutting ring, as indicated atv 31 in dotted lines, and the reciprocating die element II is lowered. As the bottom end of the die element II enters the ring I2 the member 29 severs the blank from the sheet, and upon further downward movement, shapes the blank over the upper end of the molding block I5 forming the body portion 38, the peripheral wall 39, and the outwardly extending flange 40, which is flattened against the upper face 28 of the ring I6 by the lower annular face of the die I I. When the die element I I is raised, the end being formed..

usually is lifted therewith, and is ejected therefrom by the knock-out block 39 when the upper end of the stem 32 strikes an abutment (not shown). Air vents 4I and 42 are provided in the shearing block 29 and knock-out block 39, respectively, to insure rapid disengagement of the article.

The closure is then further shaped by intermediate dies illustrated in Figures 2, 3 and 4, wherein 43 indicates generally the lower or stationary die portion and 44 the upper or reciprocating portion, which trims the flange to the correct size and uniform width and then bends the same into parallelism withl the wall 39. In the initial stamping as hereinbefore described, there is no assurance of the raised body portion 38 being exactly centered in the disc which is severed by the cutting edge I9 for as soon as the dies begin to shape the blank, the periphery of the blank is contracted and drawn away from the inner face of the ring I2, and there is no way to maintain the blank perfectly centered on the block 22. It is for this reason that the diameter of the blank as severed is larger than ultimately necessary and the ange 40 is usually irregular or vuneven in width. Therefore, it is necessary to trim the flange to a true or even width in the secondary stage of the operation, so that the ultimate outer flange or skirt will be exactly even and uniform in depth.

As shown, the die portion 43 comprises a hollow cylindrical stationary member 45, an axially movable block 46 therein, and means for raising and lowering said block. The member consists in a base portion 41 arranged in a recess 48 in the support I4, and an upwardly extending cylindrical wall 49 having a flat upper face 50, the outer edge 5I being sharp for a purpose hereinafter mentioned. This cylindrical member is securely held in position within the recess 48, as by screws 52.

4 The block 46 is cylindrical and is formed with a raised portion 53 having a diameter and depth to nt snugly in the body portion of the closure within the wall 39 as formed in the preceding 5 stage, and a peripheral face 54 to ilt under the inner portion of the flange 40. The block 46 is initially held in raised position by rods 55, so that the .face 5.4 is flush with the upper face of the wall 49 as illustrated in Figure 2 of the drawings.

10, :When the block is in its lowermost position, the

. bottom thereof preferably rests on the top of the base 41, and the upper face of the portion 53 is "then in a plane slightly below the plane of the upper end of the wall 49, or approximately the 15 distance equal to the thickness of the paper stock.- See Figure 4. The rods 55 extend through the base 41 and support I4 and are connected by an operating plate or yoke 56. A vent 51 permitsfree actuation of the block 45, and vents 58 in block 46 permit ready disengagement of the end from the block.

The reciprocative portion 44 of the die comprises a head having a shearing edge, a forming flange, and an interposed releasing or stripping ring. The head consists in a disc or block 59 formed with a depending annular wall 60 having a cutting edgeGI which cooperates with the edge 5I to trim the outer portion of the flange 40. The wall 69 forms a cylindrical recess 62 within which is centrally xed a block 63, as by a screw 64. The under face of the block is shaped to conform to and flt snugly over the body portion 38 and wall 39 of the closure as it rests on the block 46, and to thisend has a recess 65 to receive the raised central portion of the block and the corresponding portion of the closure, and a peripheral nange 66 defining said recess and about which the flange 40 is turned up to form the annular channel in the manner illustrated in Figure 4. The outer diameter of the flange 66 is less than the internal diameter of the cylindrical wall 49 for a purpose hereinafter described, and the lower edge of the flange 66 is in a plane slightly above the plane of the cutting edge 6I, or substantially the thickness o f the paper stock, so that as the upper die assembly is lowered the flange 66 will engage and clamp the flange 40 against the face 54 as the edges 5I and 6I shear off the surplus edge, as illustratedin Figure 3 of the drawings. During con- 0 tinued downward movement of the head 44, the

" block 46 is forced downwardly until it rests on the base 41, and the flange 48 of the closure is bent upwardly by the wall 49 against the forming flange 66 as illustrated in Figure 4.

5 Interposed between the wall 60 and the flange 66 is a disengaging or stripping ring 61 having a llimited reciprocating movement. The lower edge of the ring 61 has a face 68 equal in width to that of the upper face of the wall 49, and which 60 liesvin the plane of the lower face of the wall 69 when said ring is in lowermost relative position, that is when the die portion 44 is raised, and the inner edge of the face 68 is rabbeted as at 69 to lie in the plane of the edge of the flange G5 66 at such times. The vertica1 movement of the stripping ring 61 within the head 44 is substantially equal to the depth of the upturned outer flange of the closure for reasons appearing hereinafter. Its upward or retracted move- 70 ment is limited by contact with the lower face of the disc of block 59, as shown in Figure 4, and its downward movement is limited by an inwardly extending flange 'I0 on the ring which engages a shoulder 1I formed on the block 63 7;; by reducing the diameter of the inner or base 7; thersame inwardly into thepath of the conical face |03 which'now clamps the flange firmly be' tween the same and the conical face |01 of'the flange IBS; forming a smooth, slightly conical inner face to the skirt so that said face will fit snugly against the adjacent wall of a container' to which it is applied. Formed in the face. of the conical wall |03 is an annular series of grooves or corrugations H9 into which a portion of. thei outer face of the skirt is pressed to take vup a portion of the excess mass of material as above described, and v ccrrugate' said outer;` portion,

thereby adding strength toand'increasing the rigidity of the skirt.

FromV the abovedescribed method it .will be' apparent that an improved :end'is formedcomf prising a body portion 38 ofthe size and shape to iit within the end of the container. for which f it is designed, an annular wall 39 at substantially" right angles tothe body and a skirt 4l)l spaced from said wall forming a peripheral groove .l Hl

for the reception of the endof the container wall, Y the said skirt being slightly inwardly inclined with the'inner face thereof being smooth and the outer face corrugated.

While one form of the invention has been shown for purposes of illustration, it is to be clearly understood that various changes in the l details oi'V construction and arrangement'of parts may be made without departing from the spirit and scope of the invention as defined in the ap. l

pended claims.

`I claim:

tainers consisting in cutting a disc from a sheet portion of the desired dimensions with a periph- .l eral wall at substantially right anglesto said body portion and an outwardlyv extending flange in a plane substantially parallel with the plane of said body portion, trimming said flange to uniform width, bending said flange to form-.with said wall an annular channel, then compressing said flange l to incline the same inwardly.

2. The method of making paper endsfor contalners consisting in cutting a disc from a sheet of material, stamping the same to form a body portion of the desireddimensions with a periph-f eral wall at substantially right angles to said body portion and an outwardly extending ange in 2l h'annular skirt, and means for finishing said skirt plane parallel with the plane of said body por- Y tion, trimming said flange to al uniform width,

bending said flange tov form with said wall an annular channel, .and then compressing said flange between an'inner smooth'surface and a flange.

8 of material and shaping the blank to form a body portion with a peripheral wall at an angle to the body portion and an outwardly extending flange, means for trimming said flange to a uniform Y width and bending the same to form with saidA wall an annular channel, means for clamping said flange slightly inwardly and compressing the same to form a smooth inner face.

6'. In a Vdevice for forming paper ends for containers, means for stamping a blank from a sheet of; material and shaping the blank to form a body portion with a peripheral wall at an angle to the .body portion and an outwardly extending flange, means for trimming said flange to a uniform width and bending the same to form with said wall an annular channel, means for clamping said flange slightly inwardly and compressing the same to form a smooth inner face and a corrugated outer face.

7. In a device for forming paper ends for containers, means for stamping a disc from sheet' stock, means for shaping the disc to form a body portion with a peripheral wall and an outwardly extending flange, means for bending said flange .into substantial parallelism with said wall, means for turning the flange inwardly and contracting the edge thereof and means for cramping the same in the contracted form.

8.' In a device for forming paper ends for conztainers, means for cutting and shaping a blank to form a body portion with a peripheral wall at substantially right angles thereto and an outwardly extending flange, in combination with an intermediate die comprising a stationary assembly including an annular wall having an upper end of less diameter than the diameter of said outwardly extending flange and adapted to support the same with the edge of the flange projecting beyond the same, a reciprocating assemfbly including an annular Wall adapted to cooperate with the said annular wall of the stationary assembly to trim said flange, and cooperating means in said stationary and reciprocating assemblies to bend said flange into substantial parallelism with said peripheral wall of the blank,

and means for cramping the edge of said flange inwardly.

9. In a device of the class described, means for shaping a blank to form a body portion with an comprising an inner conical member adapted to be' positioned within said skirt and a cooperating hollow conical member movable axially over the first said conical member to clamp said skirt beafitween them, the portion of said hollow conical corrugated outer surface to produce a smooth inner face and a corrugated outer face on: said 3. In a method of forming peripheral flanges onpaper ends for containers, the steps of s'tamping a blank to form a body portion and'- a peripheral flange and then compressing said flange between an inner smooth conical face and'anou'ter corrugated conical face. .I

4. In a device for forming paper ends for'conportion with a peripheral wall at an angle to the body portion and an outwardly extending flange, f means for trimming -said flangeto a uniformvizo: Atainers'consisting in cutting a disc from a sheet width and bending the same toform'with sai'cl r wall an annular channel'. and means forA clampiing said flange slightly inwardly.

5. In a device for forming paper ends-for con'` tainers, means for Vstamping a `blank from-a sheet 75 parallel with the body portion, bending said flange member which engages said skirt being corrugated.

l0. In a device of the class described, means for shaping a blank to form a body portion with offan annular skirt, and means for finishing said,

skirt comprising an inner conical member adapted to be positioned within said skirt and a cooperatin'g hollow conical member movable axially over the first said conical member to clamp said skirt'between them, the portion of said hollow conical member which engages said skirt being corrugated and the face of the inner conical member being smooth.

11. The method of making paper ends for conof material, shaping the disc to form a body portion of the desired size with a peripheral wall at' substantially right angles to said body portion and an outwardly extending flange in a plane to form with said Wall, an annular channel, then compressing said flange between -an outer smooth continuous and flared coniform surface and an inner flared coniform surface having longitudinal grooves therein of depth insucient to form folds in said flange thereby to incline the flange in- Wardly.

12. The method of making paper ends for containers consisting in cutting a disc from a sheet of material, stamping the same to form a body portion of the desired dimensions with a peripheral wall at substantially right angles to said body portion and an outwardly extending flange in a plane substantially parallel with the plane of said body portion, bending said flange to form with said wall an annular channel, then compressing said flange between an inner smooth coniform surface and an outer coniform surface having narrow closely spaced longitudinal grooves therein of a depth less than the thickness of the paper thereby to provide an outer channel defining wall which is internally smooth and continuous and inclined inwardly relatively to said annular wall and having outstanding shallow ribs at its outer surface.

13. In yapparatus of the character described, means for shaping paper ends each having a central body portion and inner and outer wall portions connected with each other and said body portion and defining a body end receiving channel, said means including a flared coniform edge insertable in said channel as a backing for said outer wall portion, and `a coniform presser Wall engageable with the outer surface of the outer wall portion to cramp the same against said coniform edge to bend and hold said outer wall portion inclined inwardly with relation to said inner wall portion.

14. In apparatus of the character described, means for shaping paper ends each having a central body portion and inner and outer wall portions connected with each other and said body portion and defining a body end receiving channel, said means including a flared coniform edge insertable in said channel as a backing for said outer Wall portion, and a coniform presser wall engageable with the outer surface of the outer wall portion to cramp the same against said coniform edge to bend and hold said outer wall portion inclined inwardly with relation to said inner wall portion, the outer surface of said coniform edge being smooth and continuous, and the inner surface of said coniform presser wall where it opposes the outer paper end wall portion being continuous and corrugated.

15. In apparatus of the character described, means for shaping paper ends each having a central body portion and inner and outer wall portions connected with each other and said body portion and defining a body end receiving channel, said means including a flared coniform edge insertable in said channel as a backing for said outer wall portion, anda coniform presser wall engageable with the outer surface of the outer wall portion to cramp the same against said coniform edge to bend and hold said outer wall portion inclined inwardly with relation to said inner wall portion, said coniform edge extending from a cylindriform carrier, and said coniform presser wall being formed on a cylindriform carrier slidably telescoped over the first mentioned carrier.

WILLIAM F. PUNTE.

REFERENCES CITED The following references are of record in the file of this patent:

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